Garmisch-Partenkirchen has a lot of hotels, but it can still be quite booked in late October. Hence, do not wait too long with the booking.
We cannot offer any specific blocked rooms in a hotel. Hence, all participants have to find accommodation themselves.
There are also hotels in the neighboring villages Grainau and Farchant, but we recommend to get a hotel room in Garmisch or Partenkirchen because it will be easy to reach the KIT Campus Alpin by bus. Ideally your hotel should be close to a bus stop of the line 2, see the plan of bus lines, where KIT Campus Alpin is at stop "Hammersbacher Fussweg" almost at the left end of line number 2.
In case of questions, we can assist you, e.g. via Slack.